Many American suffer from vision problems. Refractive errors are the most common ones, according to the National Eye Institute. They occur when the shape of the eye prevents the retina from receiving direct light.
Refractive errors can take many forms. Nearsightedness is when nearby objects can be seen normally, but distant objects appear blurred. The condition affects roughly 30 percent of people in the United States, according to the American Optometric Association (AOA). Farsightedness is when faraway objects can be seen clearly, but nearby objects are unfocused. If farsightedness is mild, corrective lenses may not be required.
Types of eye disorders
Astigmatism is a condition caused by an irregularly shaped cornea or lens. This impairs the retina’s ability to adequately focus. As a result, blurred vision occurs at any distance. Astigmatism can also coexist along with nearsightedness or farsightedness.
Presbyopia is another common vision problem that refers to difficulty focusing on close objects because of inflexibility in the crystalline lens of the eye. According to the AOA, the condition occurs naturally as a result of aging and cannot be prevented.
Glaucoma refers to a collection of eye conditions that gradually damage the optic nerve over time. The optic nerve carries signals from the eye to the brain, so this can result in vision loss. According to the AOA, glaucoma is the second leading cause of blindness in the United States. It is associated with few symptoms, but the most common one is peripheral vision loss. In more severe cases, it is associated with headaches, blurred vision and eye pain. However, the majority of glaucoma cases cause gradual vision loss. The National Eye Institute reports that symptoms of a vision disorder may include things like double vision, haziness, glare or halos around bright lights, squinting, headaches and eye strain.
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